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Reports implementations of <code>Iterator.hasNext()</code> or <code>ListIterator.hasPrevious()</code> that call
<code>Iterator.next()</code> or <code>ListIterator.previous()</code> on the iterator instance. Such calls are almost certainly an error, as methods
like <code>hasNext()</code> should not modify the iterators state, while <code>next()</code> should.
<p><b>Example:</b></p>
<pre><code>
  class MyIterator implements Iterator&lt;Integer&gt; {
    public boolean hasNext() {
      return next() != null;
    }
  }
</code></pre>
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